Abrading machine



Jan. 1942- c. o. JOHIIVYSON 2,269,311

ABRADING MACHINE Filed Nov. 3, 1939 3 Sheets-Sheet l INVENTOR Cdr t 0. Johnson,

Jan. 6, 1942. c. o. JOHNSON ABRADING MACHINE.

Filed MW. 3, 1959 3 Sheets-Sheet 2 CQQYO. Quad,

- ATTORNEYS Jan. 6, 1942. c. o. JOHNSON I ABRADING' MACHINE 3 Sheets-Sheet 3 Filed Nov. 3, 1939 c rs o. J

INVENTOR ohnson, Q kT gkBs I Q 72 Q A 4 g 2 wo wo III fill |l.\ a aw i Q s a a Patented Jan. 6, 1942 UN ITED STATES PATENT a OFF I CE 2,269,311 ABRADING MACHINE Carl 0. Johnson, Springville, N. Y. Application November 3, 1939,,seriai-neeoaers 3 Claims.

Thisinvention relates to machines for grinding and/or polishing flat metal, and has particular reference to machines for simultaneously bufiing a multiplicity of work pieces such as knife .blades or the like during manufacture thereof.

My machine functions in such manner that the work pieces are automatically moved alternately toward and between and away from oppositely disposed rotating rolls and are simultaneously oscillated in directions parallel to the rotational axesof said. rolls. It is desirable in machines of this type that the work pieces be moved with an uninterrupted and smooth slow motion in all directions of movement so that the surfacesof objects and advantages of the invention will appear from the specification herein.

In the drawings:

Fig. 1 is a plan of a machine constructed according to the invention;

Fig. 2 is an end elevation-of the machine of i Fig. 1 with a supporting member thereof removed. I

Fig. 3 is a vertical section, on an enlarged scale, taken substantially along line III--III of Fig. 1. 1

In practicing the invention the machine is provided as shown in the figures of the drawings of a type generally comparable with the disclosure in the application of Carl 0. Johnson hereinabove mentioned, and in general comprises a table l supported on standards ll. Upright bearing blocks l2 rise from each end of the table l0.

As shown in Fig. 2, a pair of rock shafts [3 are joumalled in the upper ends of the uprights l2 and said rock shafts each carry a pair of rock arms l4 that rotatably support at their free ends upper and lower polishing rollers l5 and [6, respectively. The rollers l5 and I6 are connected through means of shafts to electric driving motors l1 and I8, respectively. The rock shafts [3 are geared-together as at 20 to cause-simul- 1 taneous movement of the polishing rolls I5 and [6 toward and away from each other when adjusted by means of an adjusting screw 22 threading through blocks carried by extensions on the free ends of the arms I4 at one end of the machine opposite the geared. connections 20..

A pair of guiderails 25 .are mounted upon the upper side of thetable top In and extendin a directionat right angles to the longitudinal axes of the rollers l5 and 16. A slide plate 26. having opposite side edges 2.? slidably and. interlockingly engaged with the guides 25 is movable over said guides in a. direction at right. angles to the longitudinal: axes of the rollers.

, A device, for effecting reciprocatory movements .of the slide plate 26 is provided including general a fluid cylinder 28 secured to and depending from the table top [0 with a piston rod 29..projecting fromone endof the cylinder 28 engaged with an arm 30 .at .a point forwardly of the front edge of'the table top H] with the arm 30 extending upwardly for attachment to the underside .of the slide plate 26. For effecting reciprocation of the piston rod 219 within the fluid cylinder .28, a pump 3|v is provided. with a beltv and pulley connection 32 with the shaft of the electric motor 18; the pump 3| drawing fluid from a tank 33 ina standard I I by way of a pipe 3.4, and feeding the fluid under pressure by way of a pipe .35 to a multi-way valve 36. .Pipes .3] from the multi-way valve 36 deliver the fluid to the fluid cylinder 28 to. effect reciprocation of the piston 29. and reciprocatory movements of the slide plate 2 5; the fluid in the cylinder 28 passing through. the pipe lines 3] through the multi-way valve 136, and being returned by way of the con- .duit. 38 .to the fluid tank 33. If desired, the fluid flowing through the pipe from the pump 3| maybe returned or by-passed to the tank. 33 before delivery to the multiple-valve 36 by way of. the valve, device 39 controlled by a hand operated lever 40..

The valve 36 is of standard displaceable plunger type having passageways for selective communication with conduits in the casing thereof in such manner that when the plunger is at one. end of the casing fluid pressure from .the compressor 3| is admitted through the valve '36 to one end of the cylinder 28; and when the plunger is at the other end of its stroke the fluid pressure from the pump is admitted through the valve 36 to the opposite end of the cylinder 28.

A'pilot valve 4| is provided for automatic shifting of the plunger of the valve 36 through control of fluid pressure alternately admitted to opposite ends of the plunger of the valve 36. The pilot valve 4| comprises a. casing and a rotatable core provided with. passages for selective communication with pairs of conduits through the casing in such manner that when the core is in one position of adjustment fluid pressure from the pump 3| is enabled to pass through the pilot valve and into the valve 36 against one end of the plunger thereof; and when the rotatable core is in another position of adjustment the fluid pressure from the compressor is out off from the first mentioned end of the plunger and is admitted to the valve 36 at the opposite end of the plunger. A flnger 45 extends laterally from the core of the pilot valve M and is adapted to engage spaced blocks 46 mounted upon the plate 26 for shifting the position of the valve core at opposite ends of the strokes of the plate as are procured by the application of fluid pressure at opposite ends of the hydraulic cylinder 26. The blocks 46 are independently adjustable for varying the spacing therebetween, and also theultimate limits of carriage movement relative to the base may thus be varied as desired.

The rear end of the slide plate 26 carries integral laterally projecting plate portions 58 (Fig. 1) to which a pair of resilient blade-like arms 59 and 60 are attached at their rear ends in rigidly anchored relation, and the arms are substantially co-extensive with the length of the slide plate 26. The forward or free ends of the resilient arms carry in mounted relation thereon a work holder frame 6| comprising upright blocks 62 and cross arms 65 connected at their ends to the blocks 62 to provide a rigid box like structure. Pivot bearings 61 connect the box structure to the free ends of the arms 59 thus permitting the work supporting frame to remain substantially parallel to the roll axes during lateral movement thereof. Clamping plates III and I2 are carried by the upper ends of the box structure for detachable mounting of the articles to be polished or buffed, as shown and described in my previous patent applications.

Arrangement is made for effecting reciprocating movement of the work holder parallel to the roll axes in a manner identical to that provided for reciprocation of the plate 26 back and forth perpendicular to the rolls. As shown, the arrangement includes a hydraulic cylinder 90 and a piston 92 connected to a cross arm 04 of the work holder frame. A displaceable plunger type valve 96 is provided as in the case of the slide reciprocation device hereinabove described and a pilot valve I is similarly provided for control of the valve 96; the pilot valve I00 being operated by adjustable fingers I02 mounted on the slide plate 26.

As illustrated more specifically in Fig. 3, the mechanism for providing transverse oscillation of the work holder frame 6I comprises a fluid pressure inlet conduit I04 leading from the fluid pressure reservoir 33 into the interior of the casing of the plunger valve 96 at the center thereof. A reciprocatable plunger I06 is slidably'mounted within the valve 96 and is provided with enlarged center and opposite end portions engaging the cylinder casing in fluid-tight relation. Conduits I08 and I09 lead through suitable ports through the cylinder casing 96 at opposite sides of the longitudinal center thereof into connection with the cylinder 90 at opposite ends thereof so as to apply fluid pressure forces against the enclosed piston head upon shifting of the plunger I06 to opposite end portions of the valve casing 96. Outlet ports leading through the casing 96 from positions at opposite sides .of the longitudinal center thereof are arranged in open communication with a fluid discharge conduit I I0 which provides an arrangement for return of the pressure applying fluid to the reservoir 33; the conduits IOB-I09 functioning alternately as pressure supplying and fluid-returning conduits in connection with the operation of reciprocating the piston 92 for the work holder frame oscillation process. To cause the plunger I06 to be reciprocated longitudinally within the valve casing 96, the pilot valve I00 is provided to comprise 'a casing II2 carrying a fluid-tight fitted rotor I I4 which is perforated to provide for two-way transmission of fluid under pressure through conduits II6II'I into the interior of the valve casing 96 at opposite ends thereof so as to apply fluid pressure forces against opposite ends of the plunger I06. A fluid pressure inlet conduit I I8 is in open communication with the primary fluid pressure inlet conduit I04 so as to provide available fluid under pressure to the interior of the pilot valve casing H4, and a fluid escape conduit H9 is arranged in communication with the interior of the casing II4 for return of fluid to the primary return conduit III] as itis ejected ahead of the plunger I06 during its reciprocative movements in response to application of fluid pressure forces at the oppoite ends thereof.

From the above detailed description of the invention it willbe apparent that as the fluid means effects reciprocation of the slide plate 26 the motors I1 and I8 rotate the polishing or bufling rollers I5 and I6. Simultaneously the hydraulic cylinder-piston device coupled to the cross arm 94 provides sidewise reciprocation of the work holder frame; the side arms 59 and being flexed during movement thereof in either direction. Thus the work holder is given oscillative movement in a curvilineal path, and the movements in either direction are smooth and uninterrupted. In this respect the mechanism of the present invention provides a distinct advantage over prior mechanisms for the purpose because there is no possibility of lost motion in the reciprocation control devices, and it will be understood that the resiliency of the spring arms 59 and 60 cooperates with hydraulic transverse reciprocation mechanism to obviate any possibility of lost motion in the lateral movement of the workholder with the result that the Work pieces are moved in an improved manner relative to the rolls and more uniformly processed as a result thereof. 7

Although only one form of the invention has been shown and described in detail, it will be apparent to those skilled in the art that the invention is not so limited but that various changes may be made therein without departing from the spirit of the invention or from the scope of the appended claims.

I claim:

1. In a polishing and buifmg machine, a pair of buffing and polishing rolls, means to drive the rolls, a slide member movable towards and away from the rolls in a line at right angles to the longitudinal axes of the rolls, a pair ofresilient arms-anchored at one end to the slide member, a work holder carried by the other ends of the resilient arms by means of pivotal connections therewith, and means for moving the arms against resiliency thereof to cause the work holder to oscillate through arcuate paths traversing the path of movement of the slide member, .said arm moving means comprising a reversible hydraulic pressure transforming device mounted upon said slide member and movable therewith.

2. In a polishing and bufiing machine, a pair of buifing and polishing rolls, means to drive the rolls, a slide member movable towards and away from the rolls in a line at right angles to the 1ongitudinal axes of the rolls, hydraulic means for moving said slide member towards and away from said rolls, a pair of resilient arms anchored at one end to the slide member, a work holder carried by the other ends of the resilient arms by means of pivotal connections therewith, and independently operating hydraulic means mounted upon said slide member and operatively associated therewith and with said work holder for independently imparting reciprocating movements in transverse directions to said work holder against the resiliency of said arms, whereby said work holder is moved through a culvilineal path.

3. In a polishing and bufiing machine, a pair of bufiing and polishing rolls, means to drive the rolls, a slide member movable towards and away 7 from the rolls in a line at right angles to the longitudinal axes of the rolls, a pair of resilient arms anchored at one end to the slide member, a work holder carried by the other ends of the resilient arms by means of pivotal connections therewith, and independently operating hydraulic means mounted uponsaid slide member and operatively associated therewith and with said work holder for independently imparting reciprocating movements in transverse directions to said work holder against the resiliency of said arms, whereby said Work holder is moved through a curvilineal path, said hydraulic means comprising independent two-way piston cylinder devices and independent control valves therefor, said control valve devices each comprising a fluid pressure operable valve member and a pilot fluid valve therefor and means connected with the pilot-valve and responsive to the work holder movement for operating the pilot valve in response to the reciprocating movement controlled thereby.

CARL O. JOHNSON. 

